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Dana Pinion Nut Loosened after 4 years??? #1285017 08/13/12 10:24 PM 08/13/12 10:24 PM
Joined: May 2007 Posts: 1,443 Maryland D Dads426 OP pro stock
Dads426 OP pro stock D Joined: May 2007 Posts: 1,443 Maryland	Went to Beaver Springs last weekend and after going a few rounds the car developed a vibration after letting off at the finish line. Got worse the next run (we lost anyway), so we put it away and checked it at home (didn't notice anything out of the ordinary at the track, but knew something was wrong). Got it home and pulled the driveshaft (it was OK) but found the pinion nut loose. It has been on there for 4 years with no problems, but the nut had no crush left as a locknut. Oil, gears and bearings look and feel good. Should I clean the treads use oil on the face of the washer and nut, and loctite red on the threads or buy a new locknut and use loctite for a little extra insurance? Any reason why this thing loosened (I used the Mancini pinion locking tool and a BF breaker bar to tighten it when I set it up). As you may recall, we were having problems with tire shake and I'm wondering if that caused it to loosen. Thanks for the help 2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion

Re: Dana Pinion Nut Loosened after 4 years??? [Re: Dads426] #1285018 08/13/12 10:32 PM 08/13/12 10:32 PM
Joined: May 2005 Posts: 6,446 NJ-USA H HPMike master
HPMike master H Joined: May 2005 Posts: 6,446 NJ-USA	Quote: Went to Beaver Springs last weekend and after going a few rounds the car developed a vibration after letting off at the finish line. Got worse the next run (we lost anyway), so we put it away and checked it at home (didn't notice anything out of the ordinary at the track, but knew something was wrong). Got it home and pulled the driveshaft (it was OK) but found the pinion nut loose. It has been on there for 4 years with no problems, but the nut had no crush left as a locknut. Oil, gears and bearings look and feel good. Should I clean the treads use oil on the face of the washer and nut, and loctite red on the threads or buy a new locknut and use loctite for a little extra insurance? Any reason why this thing loosened (I used the Mancini pinion locking tool and a BF breaker bar to tighten it when I set it up). As you may recall, we were having problems with tire shake and I'm wondering if that caused it to loosen. Thanks for the help I would check the U joints and pay a driveshaft shop to make sure the shaft is properly balanced. Get a new nut and use loctite red for extra insurance. Some guys like to stake the nut, which is effective, but then you will likely do damage to the threads when you take it apart. I dont stake the nut and have never had a problem and I build a fair amount of D60's. MB

Re: Dana Pinion Nut Loosened after 4 years??? [Re: HPMike] #1285019 08/13/12 10:46 PM 08/13/12 10:46 PM
Joined: May 2007 Posts: 1,443 Maryland D Dads426 OP pro stock
Dads426 OP pro stock D Joined: May 2007 Posts: 1,443 Maryland	Thanks. Driveshaft is a chrome-moly unit and u-joints are free with no play. You can drive this car at 135 mph with one arm out the window and a finger on the wheel it is so smooth. 2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion

Re: Dana Pinion Nut Loosened after 4 years??? [Re: Dads426] #1285020 08/14/12 03:52 AM 08/14/12 03:52 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	That happened to me some years back on my street car which was a 340 Dart. The driveshaft actually fell out while driving as the nut came off. It was night and believe it or not my buddy found the nut in the gutter and we stuck it back on with pliers I had and drove it to the station we worked at to fix it for that night. I ended up putting a new nut and washer on with red loctite. Never came loose again but ever since then I use loctite on all my pinion nuts. I just used loctite on my buddies pinion nut I set up a few months back also. I dont know why mine came off that night but it did not hurt anything as everything was fine in the rear. Ron

Re: Dana Pinion Nut Loosened after 4 years??? [Re: 383man] #1285021 08/14/12 04:10 AM 08/14/12 04:10 AM
Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio dartman366 I Live Here
dartman366 I Live Here Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio	Had it happen to me years ago on a 8.750,,just loc tited the thing and tightened it back up and never happened again. Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.

Re: Dana Pinion Nut Loosened after 4 years??? [Re: dartman366] #1285022 08/14/12 08:23 AM 08/14/12 08:23 AM
Joined: May 2007 Posts: 1,443 Maryland D Dads426 OP pro stock
Dads426 OP pro stock D Joined: May 2007 Posts: 1,443 Maryland	Thanks guys. I'll order a new nut and use Loctite red.

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